I can see how difficult this is, actually for all of you. it sounds like you just need more space, in the emotional as well as physical sense.
I have these suggestions:
Are you able to make arrangements to have some kind of 'sitting room' apart from each other? Even if it's just re-arranging your bedroom so there is space to sit and do what you like - rather than always be thrown together.
Do you have anywhere you could stay for awhile that wouldn't cost you anything? A relative who needs a bit of company, signing on to do house sitting or similar. It sounds as if you are retired, but I'm not sure.
Work on making plans for your move concrete. I'm afraid I hear this sort of thing quite often, that then doesn't come about for some reason. So I would make sure the finances are sound, maybe even work on a back-up plan.
PS: as I write, I have just waved to an neighbour. This is a couple in a similar situation to you. The 'close to retirement' couple go all around the UK as a handyman / housekeeper team, sometimes house sitting, sometimes staying whilst 'staff' are away. It gives them space from their daughter & her family, and they are saving to buy some sort of holiday business together. I have no idea if that would be something you could consider, but was quite a co-incidence so I thought I'd add it!